FAQs: Batteries


The battery comes in a cabinet that also contains the inverter, isolators and energy management computer (most other battery systems have additional boxes and enclosures). The cabinet measures 1650 high, 600 wide, 280mm deep and has a total weight of about 100kg.

The battery has a nominal capacity of 6.4 kWh with a standard charge rate of 3 kWh and a standard discharge rate for 3 kWh. During a power cut it can discharge at up to 3.6 kWh for short periods.


The battery has a lifespan of about 10 years. As part of the solarZero service we’ll replace the battery, as needed, once during the 20-year agreement, at no extra cost to you.


The battery will automatically power some key circuits in your home when there’s a power cut. Typically those circuits will include your kitchen and lounge so that you have lighting and can use low energy use appliances like your fridge, computers, router and TV. It will not support heavy load circuits like your oven, hot water cylinder or heat pump.

In the event of a power cut it will take a couple of seconds before devices connected to the circuits with battery backup come back on. These circuits will remain live until the battery reaches a preset minimum level of charge.

If it’s sunny, the solar panels will continue to power the backup circuits and charge the battery.

It is wise to switch off anything you don’t absolutely need to maximise the time remaining for the devices you do need.

If you try to draw too much power at once, the battery will shut down. If this happens you should switch off some devices and wait for the battery to switch back on.


The battery will remain off until the installation has been approved by an independent inspector, and your meter has been changed to an import/export meter. In most cases the inspector will switch on the battery. If required, we’ll call you if there’s anything you need to do to complete the process.


We’ve programmed the battery to buy and use power at times that deliver the best rates for you.

It will charge up with grid power during the night when electricity rates are low. It will use this stored electricity to power your home at the start of the day. This will help minimise the amount of electricity you need to buy from the grid during the peak time in the morning when rates are high.

During the day the battery will charge up with surplus solar power. If required, it will top up with power from the the grid.That stored electricity will be used to power your home during the evening peak when grid rates are high again.

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